Drive-well tube



(No Model.) 2 Sheets-Sheet l.

W. c. ALLISON. DRIVE WELL TUBE.

No. 244,023.l Patented July 12, 1881.

(No Model.) 2 sheets-sheet 2.

- W. C. ALLISON.

DRIVE WELL TUBE.-

NO. 244,023. v Pateryed July 12, 1881.

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Nirnn STATES ATENT FFME,

DRIVE-WELL TUBE.

SPECIFICATION forming part of Letters Patent No. 244,023, dated July 12, 1881.

Application filed February 17, 1881. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM C. ALLIsoN, of the city and county of Philadelphia, and State of Pennsylvania, have invented an' Improvement in Drive-Well Tubes, of which the following is a specification.

My invention relates to drive-well tubes or pipes for sinking Artesian wells in general 5 and it consists in a novel construction of the coupling joining` together any two adjacent sections of tubing, whereby the exterior of the drive-Well tubes is of uniform diameter throughout; further, in the construction of the lower end of the drive-well tube and its shoe, all of which is more fully set forth in the following specification and shown in the accompanying drawings.

Heretofore drive-well tubes or pipes have been coupled together by means of a socket, into which the ends of two adjacent tubes were secured until they butted against one another. By this construction the hole to be eut was, of necessity, larger in diameter than the socket, since thesocket must be capable of passing freely up and down therein, and for this reason the shoe was required to cut a hole of much larger diameter than was really required by the drive-well tubing itself. The shoe was heretofore screwed on the lower half 'of the lowest socket, and was of greater diameter than the socket.

The object of my invention is to overcome the necessity of cutting a larger hole than is absolutely required for free play of the drivewell tubing, and thereby obviate the objections to the old construction of drive-well tubing and defects incident upon its use.

In the drawings, Figure 1 is a vertical section of my improved drive-Well tubing and its shoe. Fig. 2 is a similar section of the old form of pipe. Fig. 3 is another method of securing shoe to pipe.

A are the sections of tubing, and are upset upon their lower ends, as at B, which upsetting is provided with a vanishing screw-thread, C D. This screw-thread may be either of uniform threads or vanishing singly or doubly, as shown 5 but in practice I prefer the latter. The upsetting B extends inward, narrowing the internal diameter of the pipe at this extremity, and at the point where the screw- Hence all of the sections have corresponding tops and corresponding bottoms, with the single exception of the lowermost or bottom section, upon which the shoe M fits and is secured. This lowermost section, F, is similar to those described above, except that the upsetting is about three times as long, and the offsetting L is as deep throughout as the deepest part of the offsetting on upsetting B.

The shoe M is made of steel, and is provided with a cutting-edge, J. The internal diameter of the shoe at the bottom is equal to the internal diameter of the upsetting on tube F, and is slightly greater than the upsetting on tubes A. The upper part of the shoe is of the same external diameter, but is of greater internal diameter, the difference in internal diameter being equal to double the thickness of the upsetting-extension G. By the foregoing construction the pipe or tube F is provided with a shoulder, L, and the shoe M with a shoulder, I, the ends of the tube F and shoe corresponding to the shoulder.

In securing these tubes together the top of one tube A is screwed over the bottom of the next tube A above it, as-.shown, and tire end of the lower tube butts against the shoulder K near the bottom of the upper tube. When this is done the only part of the joint perceptible from the outside is a single encircling line, the pipe or tubing being of uniform diameter throughout. The internal upsetting provides metal for the joint or coupling and insures strength. The lower tube, F, is screwed over the bottom of the tube Avnext above it, as described above, and the shoe Mis heated, and when sufficiently expanded it is slipped over the extension G( of the reduced upsetting until the shoulders Iand L both butt against their corresponding ends, and as the shoe cools it is The external diameter of the shoev is slightly larger than the tubing, so as to cut' shrunk on.

a hole of a diametersufticiently large to allow easy play of the tubing therein. A tubing of eight (S) inches, adapted for a casing of live and five-eighths (5g) inches, will require a hole IOO proved tubing, which allows the use of a given-- sized casing with a hole of less diameter than heretofore required.

It is immaterial to my invention whether the screw-threads are even, tapered, or vanishing,v

orwhetherthe shoe is shrunk on or screwed on, as my invention consists, broadly, in so constructing the drive-well tubing that no sockets will be required and the external diameter of the tubing will be uniform throughout.

When the shoe lVI is secured onto the pipesections A the lower section, F, would be similar to sections A, and the top of the shoe would be provided with an internal or female screwthread on top similar to those on the tops of sections A, except that the thickness of metal is much greater, providing the extra shoulder I, as shown in Fig. 3. The lower or cutting part of the shoe is enlarged or upset, so that its external diameter is slightly greater than the diameter of the drive-well pipe.

I am aware ofthe patent to Bolles, of 1855, and claim nothing therein shown or described.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A drive-well tubing composed of single tubes or sections in which the external diameter of the tubing is uniform throughout, said sections being directly screwed into each other, the end of one butting against a shoulder on the adjacent one, and the end of the` tube provided with the shoulder being internally upset, substantially as shown and described, and for the purpose specied.

2. A drive-well tubing composed of sections of tubes A, internally screw-threaded at the top, and upset and externally screw-threaded on the bottom, said upsetting extending iuward and carrying the lower external screwthread, which is of less external diameter than the tube, substantially as and for the purpose specified.

3. In tubing for drive-wells, two or more sections of pipe directly joined together by male and female threads and without the use of a coupling, the ends of the tubes having the male screw-threads being internally upset, the end ot' one tube butting against a shoulder on the end of the pipe next adjacent, the external diameter of said tubing being uniform throughout, substantially as and for the purpose specined.Y e.

4. In a drive-well tubing, the combination of sections of tube A, provided at the top with female screw-threads E and at the bottom with an internal upsetting, B, male screw-threads C, cut thereon, and shoulder K, substantially as and for the purpose specified.

5. In a drive-well pipe, two or more sections joined together and having their exterior diameter uniform throughout, said sections having their upper ends internally screw-threaded and their bottom ends internally upset and externally screw-threaded, in combination with a bottom section adapted to carry a replaceable shoe, substantially as and for the purpose specified.

6. In a drive-well pipe, a bottom section of tubing provided with a screw-thread on the top, and adapted to be secured to the upper sections of tubing, and on the bottom with a shoulder, in combination with a replaceable shoe or cutter adapted to be shrunk on the bottom of said bottom section and rest against the shoulder of the same, as and for the purpose specified.

In testimony of which invention I hereunto set my hand.

W. G. ALLISON.

Witnesses R. S. REED, C. F. HENDRIeKs. 

